<div xmlns:ext="http://www.extjs.com" class="body-wrap"><div class="inheritance res-block"><pre class="res-block-inner"><a href="output/Ext.util.Observable.html" ext:member="" ext:cls="Ext.util.Observable">Observable</a>
  <img src="resources/elbow-end.gif"><a href="output/Ext.data.Connection.html" ext:member="" ext:cls="Ext.data.Connection">Connection</a>
    <img src="resources/elbow-end.gif">Ajax</pre></div><h1>Class <a href="source/Connection.html#cls-Ext.Ajax">Ext.Ajax</a></h1><table cellspacing="0"><tr><td class="label">Package:</td><td class="hd-info">Ext</td></tr><tr><td class="label">Defined In:</td><td class="hd-info"><a href="source/Connection.html#cls-Ext.Ajax">Connection.js</a></td></tr><tr><td class="label">Class:</td><td class="hd-info"><a href="source/Connection.html#cls-Ext.Ajax">Ajax</a></td></tr><tr><td class="label">Extends:</td><td class="hd-info"><a href="output/Ext.data.Connection.html" ext:cls="Ext.data.Connection" ext:member="">Connection</a></td></tr></table><div class="description"><p>The global Ajax request class that provides a simple way to make Ajax requests
with maximum flexibility.</p>
<p>Since Ext.Ajax is a singleton, you can set common properties/events for it once
and override them at the request function level only if necessary.</p>
<p>Common <b>Properties</b> you may want to set are:<div class="mdetail-params"><ul>
<li><b><tt><a href="output/Ext.Ajax.html#Ext.Ajax-method" ext:member="method" ext:cls="Ext.Ajax">method</a></tt></b><p class="sub-desc"></p></li>
<li><b><tt><a href="output/Ext.Ajax.html#Ext.Ajax-extraParams" ext:member="extraParams" ext:cls="Ext.Ajax">extraParams</a></tt></b><p class="sub-desc"></p></li>
<li><b><tt><a href="output/Ext.Ajax.html#Ext.Ajax-url" ext:member="url" ext:cls="Ext.Ajax">url</a></tt></b><p class="sub-desc"></p></li>
</ul></div>
<pre><code><i>// Default headers to pass <b>in</b> every request</i>
Ext.Ajax.defaultHeaders = {
    <em>'Powered-By'</em>: <em>'Ext'</em>
};</code></pre>
</p>
<p>Common <b>Events</b> you may want to set are:<div class="mdetail-params"><ul>
<li><b><tt><a href="output/Ext.data.Connection.html#Ext.data.Connection-beforerequest" ext:member="beforerequest" ext:cls="Ext.data.Connection">beforerequest</a></tt></b><p class="sub-desc"></p></li>
<li><b><tt><a href="output/Ext.data.Connection.html#Ext.data.Connection-requestcomplete" ext:member="requestcomplete" ext:cls="Ext.data.Connection">requestcomplete</a></tt></b><p class="sub-desc"></p></li>
<li><b><tt><a href="output/Ext.data.Connection.html#Ext.data.Connection-requestexception" ext:member="requestexception" ext:cls="Ext.data.Connection">requestexception</a></tt></b><p class="sub-desc"></p></li>
</ul></div>
<pre><code><i>// Example: show a spinner during all Ajax requests</i>
Ext.Ajax.on(<em>'beforerequest'</em>, this.showSpinner, this);
Ext.Ajax.on(<em>'requestcomplete'</em>, this.hideSpinner, this);
Ext.Ajax.on(<em>'requestexception'</em>, this.hideSpinner, this);</code></pre>
</p>
<p>An example request:</p>
<pre><code><i>// Basic request</i>
Ext.Ajax.<a href="output/Ext.data.Connection.html#Ext.data.Connection-request" ext:member="request" ext:cls="Ext.data.Connection">request</a>({
   url: <em>'foo.php'</em>,
   success: someFn,
   failure: otherFn,
   headers: {
       <em>'my-header'</em>: <em>'foo'</em>
   },
   params: { foo: <em>'bar'</em> }
});

<i>// Simple ajax form submission</i>
Ext.Ajax.<a href="output/Ext.data.Connection.html#Ext.data.Connection-request" ext:member="request" ext:cls="Ext.data.Connection">request</a>({
    form: <em>'some-form'</em>,
    params: <em>'foo=bar'</em>
});</code></pre>
</p><br><br><i>This class is a singleton and cannot be created directly.</i></div><div class="hr"></div><a id="Ext.Ajax-configs"></a><h2>Config Options</h2><table cellspacing="0" class="member-table"><tbody><tr><th colspan="2" class="sig-header">Config Options</th><th class="msource-header">Defined By</th></tr><tr class="config-row  inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.data.Connection-disableCachingParam"></a><b><a href="source/Connection.html#cfg-Ext.data.Connection-disableCachingParam">disableCachingParam</a></b> : String<div class="mdesc">Change the parameter which is sent went disabling caching
through a cache buster. Defaults to '_dc'</div></td><td class="msource"><a href="output/Ext.data.Connection.html#disableCachingParam" ext:member="#disableCachingParam" ext:cls="Ext.data.Connection">Connection</a></td></tr><tr class="config-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-listeners"></a><b><a href="source/Observable.html#cfg-Ext.util.Observable-listeners">listeners</a></b> : Object<div class="mdesc"><div class="short">A config object containing one or more event handlers to be added to this
object during initialization.  This should ...</div><div class="long"><p>A config object containing one or more event handlers to be added to this
object during initialization.  This should be a valid listeners config object as specified in the
<a href="output/Ext.util.Observable.html#Ext.util.Observable-addListener" ext:member="addListener" ext:cls="Ext.util.Observable">addListener</a> example for attaching multiple handlers at once.</p>
<br><p><b><u>DOM events from ExtJs <a href="output/Ext.Component.html" ext:cls="Ext.Component">Components</a></u></b></p>
<br><p>While <i>some</i> ExtJs Component classes export selected DOM events (e.g. "click", "mouseover" etc), this
is usually only done when extra value can be added. For example the <a href="output/Ext.DataView.html" ext:cls="Ext.DataView">DataView</a>'s
<b><code><a href="output/Ext.DataView.html#Ext.DataView-click" ext:member="click" ext:cls="Ext.DataView">click</a></code></b> event passing the node clicked on. To access DOM
events directly from a Component's HTMLElement, listeners must be added to the <i><a href="output/Ext.Component.html#Ext.Component-getEl" ext:member="getEl" ext:cls="Ext.Component">Element</a></i> after the Component
has been rendered. A plugin can simplify this step:<pre><code><i>// Plugin is configured <b>with</b> a listeners config object.</i>
<i>// The Component is appended to the argument list of all handler functions.</i>
Ext.DomObserver = Ext.extend(Object, {
    constructor: <b>function</b>(config) {
        this.listeners = config.listeners ? config.listeners : config;
    },

    <i>// Component passes itself into plugin&#39;s init method</i>
    init: <b>function</b>(c) {
        <b>var</b> p, l = this.listeners;
        <b>for</b> (p <b>in</b> l) {
            <b>if</b> (Ext.isFunction(l[p])) {
                l[p] = this.createHandler(l[p], c);
            } <b>else</b> {
                l[p].fn = this.createHandler(l[p].fn, c);
            }
        }

        <i>// Add the listeners to the Element immediately following the render call</i>
        c.render = c.render.<a href="output/Function.html#Function-createSequence" ext:member="createSequence" ext:cls="Function">createSequence</a>(<b>function</b>() {
            <b>var</b> e = c.getEl();
            <b>if</b> (e) {
                e.on(l);
            }
        });
    },

    createHandler: <b>function</b>(fn, c) {
        <b>return</b> <b>function</b>(e) {
            fn.call(this, e, c);
        };
    }
});

<b>var</b> combo = <b>new</b> Ext.form.ComboBox({

    <i>// Collapse combo when its element is clicked on</i>
    plugins: [ <b>new</b> Ext.DomObserver({
        click: <b>function</b>(evt, comp) {
            comp.collapse();
        }
    })],
    store: myStore,
    typeAhead: true,
    mode: <em>'local'</em>,
    triggerAction: <em>'all'</em>
});</code></pre></p></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#listeners" ext:member="#listeners" ext:cls="Ext.util.Observable">Observable</a></td></tr></tbody></table><a id="Ext.Ajax-props"></a><h2>Public Properties</h2><table cellspacing="0" class="member-table"><tbody><tr><th colspan="2" class="sig-header">Property</th><th class="msource-header">Defined By</th></tr><tr class="property-row  "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.Ajax-autoAbort"></a><b><a href="source/Connection.html#prop-Ext.Ajax-autoAbort">autoAbort</a></b> : Boolean<div class="mdesc">Whether a new request should abort any pending requests. (defaults to false)</div></td><td class="msource">Ajax</td></tr><tr class="property-row  "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.Ajax-defaultHeaders"></a><b><a href="source/Connection.html#prop-Ext.Ajax-defaultHeaders">defaultHeaders</a></b> : Object<div class="mdesc">An object containing request headers which are added to each request made by this object
(defaults to undefined).</div></td><td class="msource">Ajax</td></tr><tr class="property-row  "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.Ajax-disableCaching"></a><b><a href="source/Connection.html#prop-Ext.Ajax-disableCaching">disableCaching</a></b> : Boolean<div class="mdesc">True to add a unique cache-buster param to GET requests. (defaults to true)</div></td><td class="msource">Ajax</td></tr><tr class="property-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.Ajax-extraParams"></a><b><a href="source/Connection.html#prop-Ext.Ajax-extraParams">extraParams</a></b> : Object<div class="mdesc"><div class="short">An object containing properties which are used as extra parameters to each request made
by this object (defaults to u...</div><div class="long">An object containing properties which are used as extra parameters to each request made
by this object (defaults to undefined). Session information and other data that you need
to pass with each request are commonly put here.</div></div></td><td class="msource">Ajax</td></tr><tr class="property-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.Ajax-method"></a><b><a href="source/Connection.html#prop-Ext.Ajax-method">method</a></b> : String<div class="mdesc"><div class="short">The default HTTP method to be used for requests. Note that this is case-sensitive and
should be all caps (defaults to...</div><div class="long">The default HTTP method to be used for requests. Note that this is case-sensitive and
should be all caps (defaults to undefined; if not set but params are present will use
<tt>"POST"</tt>, otherwise will use <tt>"GET"</tt>.)</div></div></td><td class="msource">Ajax</td></tr><tr class="property-row  "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.Ajax-timeout"></a><b><a href="source/Connection.html#prop-Ext.Ajax-timeout">timeout</a></b> : Number<div class="mdesc">The timeout in milliseconds to be used for requests. (defaults to 30000)</div></td><td class="msource">Ajax</td></tr><tr class="property-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.Ajax-url"></a><b><a href="source/Connection.html#prop-Ext.Ajax-url">url</a></b> : String<div class="mdesc"><div class="short">The default URL to be used for requests to the server. (defaults to undefined)
If the server receives all requests th...</div><div class="long">The default URL to be used for requests to the server. (defaults to undefined)
If the server receives all requests through one URL, setting this once is easier than
entering it on every request.</div></div></td><td class="msource">Ajax</td></tr></tbody></table><a id="Ext.Ajax-methods"></a><h2>Public Methods</h2><table cellspacing="0" class="member-table"><tbody><tr><th colspan="2" class="sig-header">Method</th><th class="msource-header">Defined By</th></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.data.Connection-abort"></a><b class="method"><a href="source/Connection.html#method-Ext.data.Connection-abort">abort</a></b><span class="openparen">(&nbsp;</span><span title="Optional" class="optional">[Number&nbsp;transactionId]</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">void</span><div class="mdesc"><div class="short">Aborts any outstanding request.</div><div class="long">Aborts any outstanding request.<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>transactionId</code> : Number<div class="sub-desc">(Optional) defaults to the last transaction</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.data.Connection.html#abort" ext:member="#abort" ext:cls="Ext.data.Connection">Connection</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-addEvents"></a><b class="method"><a href="source/Observable.html#method-Ext.util.Observable-addEvents">addEvents</a></b><span class="openparen">(&nbsp;</span><span title="Required" class="required">Object|String&nbsp;o</span><span class="comma">,&nbsp;</span><span title="Required" class="required">string&nbsp;Optional.</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">void</span><div class="mdesc"><div class="short">Adds the specified events to the list of events which this Observable may fire.</div><div class="long">Adds the specified events to the list of events which this Observable may fire.<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>o</code> : Object|String<div class="sub-desc">Either an object with event names as properties with a value of <code>true</code>
or the first event name string if multiple event names are being passed as separate parameters.</div></li><li><code>Optional.</code> : string<div class="sub-desc">Event name if multiple event names are being passed as separate parameters.
Usage:<pre><code>this.addEvents(<em>'storeloaded'</em>, <em>'storecleared'</em>);</code></pre></div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#addEvents" ext:member="#addEvents" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-addListener"></a><b class="method"><a href="source/Observable.html#method-Ext.util.Observable-addListener">addListener</a></b><span class="openparen">(&nbsp;</span><span title="Required" class="required">String&nbsp;eventName</span><span class="comma">,&nbsp;</span><span title="Required" class="required">Function&nbsp;handler</span><span class="comma">,&nbsp;</span><span title="Optional" class="optional">[Object&nbsp;scope]</span><span class="comma">,&nbsp;</span><span title="Optional" class="optional">[Object&nbsp;options]</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">void</span><div class="mdesc"><div class="short">Appends an event handler to this object.</div><div class="long">Appends an event handler to this object.<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>eventName</code> : String<div class="sub-desc">The name of the event to listen for.</div></li><li><code>handler</code> : Function<div class="sub-desc">The method the event invokes.</div></li><li><code>scope</code> : Object<div class="sub-desc">(optional) The scope (<code><b>this</b></code> reference) in which the handler function is executed.
<b>If omitted, defaults to the object which fired the event.</b></div></li><li><code>options</code> : Object<div class="sub-desc">(optional) An object containing handler configuration.
properties. This may contain any of the following properties:<ul>
<li><b>scope</b> : Object<div class="sub-desc">The scope (<code><b>this</b></code> reference) in which the handler function is executed.
<b>If omitted, defaults to the object which fired the event.</b></div></li>
<li><b>delay</b> : Number<div class="sub-desc">The number of milliseconds to delay the invocation of the handler after the event fires.</div></li>
<li><b>single</b> : Boolean<div class="sub-desc">True to add a handler to handle just the next firing of the event, and then remove itself.</div></li>
<li><b>buffer</b> : Number<div class="sub-desc">Causes the handler to be scheduled to run in an <a href="output/Ext.util.DelayedTask.html" ext:cls="Ext.util.DelayedTask">Ext.util.DelayedTask</a> delayed
by the specified number of milliseconds. If the event fires again within that time, the original
handler is <em>not</em> invoked, but the new handler is scheduled in its place.</div></li>
<li><b>target</b> : Observable<div class="sub-desc">Only call the handler if the event was fired on the target Observable, <i>not</i>
if the event was bubbled up from a child Observable.</div></li>
</ul><br>
<p>
<b>Combining Options</b><br>
Using the options argument, it is possible to combine different types of listeners:<br>
<br>
A delayed, one-time listener.
<pre><code>myDataView.on(<em>'click'</em>, this.onClick, this, {
single: true,
delay: 100
});</code></pre>
<p>
<b>Attaching multiple handlers in 1 call</b><br>
The method also allows for a single argument to be passed which is a config object containing properties
which specify multiple handlers.
<p>
<pre><code>myGridPanel.on({
<em>'click'</em> : {
    fn: this.onClick,
    scope: this,
    delay: 100
},
<em>'mouseover'</em> : {
    fn: this.onMouseOver,
    scope: this
},
<em>'mouseout'</em> : {
    fn: this.onMouseOut,
    scope: this
}
});</code></pre>
<p>
Or a shorthand syntax:<br>
<pre><code>myGridPanel.on({
<em>'click'</em> : this.onClick,
<em>'mouseover'</em> : this.onMouseOver,
<em>'mouseout'</em> : this.onMouseOut,
 scope: this
});</code></pre></div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#addListener" ext:member="#addListener" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-enableBubble"></a><b class="method"><a href="source/Observable-more.html#method-Ext.util.Observable-enableBubble">enableBubble</a></b><span class="openparen">(&nbsp;</span><span title="Required" class="required">String/Array&nbsp;events</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">void</span><div class="mdesc"><div class="short">Enables events fired by this Observable to bubble up an owner hierarchy by calling
this.getBubbleTarget() if present....</div><div class="long"><p>Enables events fired by this Observable to bubble up an owner hierarchy by calling
<code>this.getBubbleTarget()</code> if present. There is no implementation in the Observable base class.</p>
<p>This is commonly used by Ext.Components to bubble events to owner Containers. See <a href="output/Ext.Component.getBubbleTarget.html" ext:cls="Ext.Component.getBubbleTarget">Ext.Component.getBubbleTarget</a>. The default
implementation in Ext.Component returns the Component's immediate owner. But if a known target is required, this can be overridden to
access the required target more quickly.</p>
<p>Example:</p><pre><code>Ext.override(Ext.form.Field, {
    <i>//  Add functionality to Field&#39;s initComponent to enable the change event to bubble</i>
    initComponent : Ext.form.Field.prototype.initComponent.createSequence(<b>function</b>() {
        this.enableBubble(<em>'change'</em>);
    }),

    <i>//  We know that we want Field&#39;s events to bubble directly to the FormPanel.</i>
    getBubbleTarget : <b>function</b>() {
        <b>if</b> (!this.formPanel) {
            this.formPanel = this.findParentByType(<em>'form'</em>);
        }
        <b>return</b> this.formPanel;
    }
});

<b>var</b> myForm = <b>new</b> Ext.formPanel({
    title: <em>'User Details'</em>,
    items: [{
        ...
    }],
    listeners: {
        change: <b>function</b>() {
            <i>// Title goes red <b>if</b> form has been modified.</i>
            myForm.header.setStyle(<em>'color'</em>, <em>'red'</em>);
        }
    }
});</code></pre><div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>events</code> : String/Array<div class="sub-desc">The event name to bubble, or an Array of event names.</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#enableBubble" ext:member="#enableBubble" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-fireEvent"></a><b class="method"><a href="source/Observable.html#method-Ext.util.Observable-fireEvent">fireEvent</a></b><span class="openparen">(&nbsp;</span><span title="Required" class="required">String&nbsp;eventName</span><span class="comma">,&nbsp;</span><span title="Required" class="required">Object...&nbsp;args</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">Boolean</span><div class="mdesc"><div class="short">Fires the specified event with the passed parameters (minus the event name).
An event may be set to bubble up an Obse...</div><div class="long"><p>Fires the specified event with the passed parameters (minus the event name).</p>
<p>An event may be set to bubble up an Observable parent hierarchy (See <a href="output/Ext.Component.html#Ext.Component-getBubbleTarget" ext:member="getBubbleTarget" ext:cls="Ext.Component">Ext.Component.getBubbleTarget</a>)
by calling <a href="output/Ext.util.Observable.html#Ext.util.Observable-enableBubble" ext:member="enableBubble" ext:cls="Ext.util.Observable">enableBubble</a>.</p><div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>eventName</code> : String<div class="sub-desc">The name of the event to fire.</div></li><li><code>args</code> : Object...<div class="sub-desc">Variable number of parameters are passed to handlers.</div></li></ul><strong>Returns:</strong><ul><li><code>Boolean</code><div class="sub-desc">returns false if any of the handlers return false otherwise it returns true.</div></li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#fireEvent" ext:member="#fireEvent" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-hasListener"></a><b class="method"><a href="source/Observable.html#method-Ext.util.Observable-hasListener">hasListener</a></b><span class="openparen">(&nbsp;</span><span title="Required" class="required">String&nbsp;eventName</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">Boolean</span><div class="mdesc"><div class="short">Checks to see if this object has any listeners for a specified event</div><div class="long">Checks to see if this object has any listeners for a specified event<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>eventName</code> : String<div class="sub-desc">The name of the event to check for</div></li></ul><strong>Returns:</strong><ul><li><code>Boolean</code><div class="sub-desc">True if the event is being listened for, else false</div></li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#hasListener" ext:member="#hasListener" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.data.Connection-isLoading"></a><b class="method"><a href="source/Connection.html#method-Ext.data.Connection-isLoading">isLoading</a></b><span class="openparen">(&nbsp;</span><span title="Optional" class="optional">[Number&nbsp;transactionId]</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">Boolean</span><div class="mdesc"><div class="short">Determine whether this object has a request outstanding.</div><div class="long">Determine whether this object has a request outstanding.<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>transactionId</code> : Number<div class="sub-desc">(Optional) defaults to the last transaction</div></li></ul><strong>Returns:</strong><ul><li><code>Boolean</code><div class="sub-desc">True if there is an outstanding request.</div></li></ul></div></div></div></td><td class="msource"><a href="output/Ext.data.Connection.html#isLoading" ext:member="#isLoading" ext:cls="Ext.data.Connection">Connection</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-on"></a><b class="method"><a href="source/Observable.html#method-Ext.util.Observable-on">on</a></b><span class="openparen">(&nbsp;</span><span title="Required" class="required">String&nbsp;eventName</span><span class="comma">,&nbsp;</span><span title="Required" class="required">Function&nbsp;handler</span><span class="comma">,&nbsp;</span><span title="Optional" class="optional">[Object&nbsp;scope]</span><span class="comma">,&nbsp;</span><span title="Optional" class="optional">[Object&nbsp;options]</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">void</span><div class="mdesc"><div class="short">Appends an event handler to this object (shorthand for addListener.)</div><div class="long">Appends an event handler to this object (shorthand for <a href="output/Ext.util.Observable.html#Ext.util.Observable-addListener" ext:member="addListener" ext:cls="Ext.util.Observable">addListener</a>.)<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>eventName</code> : String<div class="sub-desc">The type of event to listen for</div></li><li><code>handler</code> : Function<div class="sub-desc">The method the event invokes</div></li><li><code>scope</code> : Object<div class="sub-desc">(optional) The scope (<code><b>this</b></code> reference) in which the handler function is executed.
<b>If omitted, defaults to the object which fired the event.</b></div></li><li><code>options</code> : Object<div class="sub-desc">(optional) An object containing handler configuration.</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#on" ext:member="#on" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-purgeListeners"></a><b class="method"><a href="source/Observable.html#method-Ext.util.Observable-purgeListeners">purgeListeners</a></b><span class="openparen">(</span><span class="closeparen">)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">void</span><div class="mdesc"><div class="short">Removes all listeners for this object</div><div class="long">Removes all listeners for this object<div class="mdetail-params"><strong>Parameters:</strong><ul><li>None.</li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#purgeListeners" ext:member="#purgeListeners" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-relayEvents"></a><b class="method"><a href="source/Observable-more.html#method-Ext.util.Observable-relayEvents">relayEvents</a></b><span class="openparen">(&nbsp;</span><span title="Required" class="required">Object&nbsp;o</span><span class="comma">,&nbsp;</span><span title="Required" class="required">Array&nbsp;events</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">void</span><div class="mdesc"><div class="short">Relays selected events from the specified Observable as if the events were fired by this.</div><div class="long">Relays selected events from the specified Observable as if the events were fired by <tt><b>this</b></tt>.<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>o</code> : Object<div class="sub-desc">The Observable whose events this object is to relay.</div></li><li><code>events</code> : Array<div class="sub-desc">Array of event names to relay.</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#relayEvents" ext:member="#relayEvents" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-removeListener"></a><b class="method"><a href="source/Observable.html#method-Ext.util.Observable-removeListener">removeListener</a></b><span class="openparen">(&nbsp;</span><span title="Required" class="required">String&nbsp;eventName</span><span class="comma">,&nbsp;</span><span title="Required" class="required">Function&nbsp;handler</span><span class="comma">,&nbsp;</span><span title="Optional" class="optional">[Object&nbsp;scope]</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">void</span><div class="mdesc"><div class="short">Removes an event handler.</div><div class="long">Removes an event handler.<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>eventName</code> : String<div class="sub-desc">The type of event the handler was associated with.</div></li><li><code>handler</code> : Function<div class="sub-desc">The handler to remove. <b>This must be a reference to the function passed into the <a href="output/Ext.util.Observable.html#Ext.util.Observable-addListener" ext:member="addListener" ext:cls="Ext.util.Observable">addListener</a> call.</b></div></li><li><code>scope</code> : Object<div class="sub-desc">(optional) The scope originally specified for the handler.</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#removeListener" ext:member="#removeListener" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.data.Connection-request"></a><b class="method"><a href="source/Connection.html#method-Ext.data.Connection-request">request</a></b><span class="openparen">(&nbsp;</span><span title="Required" class="required">Object&nbsp;options</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">Number</span><div class="mdesc"><div class="short">Sends an HTTP request to a remote server.
Important: Ajax server requests are asynchronous, and this call will
return...</div><div class="long"><p>Sends an HTTP request to a remote server.</p>
<p><b>Important:</b> Ajax server requests are asynchronous, and this call will
return before the response has been received. Process any returned data
in a callback function.</p>
<pre><code>Ext.Ajax.request({
   url: <em>'ajax_demo/sample.json'</em>,
   success: <b>function</b>(response, opts) {
      <b>var</b> obj = Ext.decode(response.responseText);
      console.dir(obj);
   },
   failure: <b>function</b>(response, opts) {
      console.log(<em>'server-side failure <b>with</b> status code '</em> + response.status);
   }
});</code></pre>
<p>To execute a callback function in the correct scope, use the <tt>scope</tt> option.</p><div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>options</code> : Object<div class="sub-desc">An object which may contain the following properties:<ul>
<li><b>url</b> : String/Function (Optional)<div class="sub-desc">The URL to
which to send the request, or a function to call which returns a URL string. The scope of the
function is specified by the <tt>scope</tt> option. Defaults to the configured
<tt><a href="output/Ext.data.Connection.html#Ext.data.Connection-url" ext:member="url" ext:cls="Ext.data.Connection">url</a></tt>.</div></li>
<li><b>params</b> : Object/String/Function (Optional)<div class="sub-desc">
An object containing properties which are used as parameters to the
request, a url encoded string or a function to call to get either. The scope of the function
is specified by the <tt>scope</tt> option.</div></li>
<li><b>method</b> : String (Optional)<div class="sub-desc">The HTTP method to use
for the request. Defaults to the configured method, or if no method was configured,
"GET" if no parameters are being sent, and "POST" if parameters are being sent.  Note that
the method name is case-sensitive and should be all caps.</div></li>
<li><b>callback</b> : Function (Optional)<div class="sub-desc">The
function to be called upon receipt of the HTTP response. The callback is
called regardless of success or failure and is passed the following
parameters:<ul>
<li><b>options</b> : Object<div class="sub-desc">The parameter to the request call.</div></li>
<li><b>success</b> : Boolean<div class="sub-desc">True if the request succeeded.</div></li>
<li><b>response</b> : Object<div class="sub-desc">The XMLHttpRequest object containing the response data.
See <a href="http://www.w3.org/TR/XMLHttpRequest/">http://www.w3.org/TR/XMLHttpRequest/</a> for details about
accessing elements of the response.</div></li>
</ul></div></li>
<li><a id="request-option-success"></a><b>success</b> : Function (Optional)<div class="sub-desc">The function
to be called upon success of the request. The callback is passed the following
parameters:<ul>
<li><b>response</b> : Object<div class="sub-desc">The XMLHttpRequest object containing the response data.</div></li>
<li><b>options</b> : Object<div class="sub-desc">The parameter to the request call.</div></li>
</ul></div></li>
<li><b>failure</b> : Function (Optional)<div class="sub-desc">The function
to be called upon failure of the request. The callback is passed the
following parameters:<ul>
<li><b>response</b> : Object<div class="sub-desc">The XMLHttpRequest object containing the response data.</div></li>
<li><b>options</b> : Object<div class="sub-desc">The parameter to the request call.</div></li>
</ul></div></li>
<li><b>scope</b> : Object (Optional)<div class="sub-desc">The scope in
which to execute the callbacks: The "this" object for the callback function. If the <tt>url</tt>, or <tt>params</tt> options were
specified as functions from which to draw values, then this also serves as the scope for those function calls.
Defaults to the browser window.</div></li>
<li><b>timeout</b> : Number (Optional)<div class="sub-desc">The timeout in milliseconds to be used for this request. Defaults to 30 seconds.</div></li>
<li><b>form</b> : Element/HTMLElement/String (Optional)<div class="sub-desc">The <tt>&lt;form&gt;</tt>
Element or the id of the <tt>&lt;form&gt;</tt> to pull parameters from.</div></li>
<li><a id="request-option-isUpload"></a><b>isUpload</b> : Boolean (Optional)<div class="sub-desc"><b>Only meaningful when used
with the <tt>form</tt> option</b>.
<p>True if the form object is a file upload (will be set automatically if the form was
configured with <b><tt>enctype</tt></b> "multipart/form-data").</p>
<p>File uploads are not performed using normal "Ajax" techniques, that is they are <b>not</b>
performed using XMLHttpRequests. Instead the form is submitted in the standard manner with the
DOM <tt>&lt;form></tt> element temporarily modified to have its
<a href="http://www.w3.org/TR/REC-html40/present/frames.html#adef-target">target</a> set to refer
to a dynamically generated, hidden <tt>&lt;iframe></tt> which is inserted into the document
but removed after the return data has been gathered.</p>
<p>The server response is parsed by the browser to create the document for the IFRAME. If the
server is using JSON to send the return object, then the
<a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.17">Content-Type</a> header
must be set to "text/html" in order to tell the browser to insert the text unchanged into the document body.</p>
<p>The response text is retrieved from the document, and a fake XMLHttpRequest object
is created containing a <tt>responseText</tt> property in order to conform to the
requirements of event handlers and callbacks.</p>
<p>Be aware that file upload packets are sent with the content type <a href="http://www.faqs.org/rfcs/rfc2388.html">multipart/form</a>
and some server technologies (notably JEE) may require some custom processing in order to
retrieve parameter names and parameter values from the packet content.</p>
</div></li>
<li><b>headers</b> : Object (Optional)<div class="sub-desc">Request
headers to set for the request.</div></li>
<li><b>xmlData</b> : Object (Optional)<div class="sub-desc">XML document
to use for the post. Note: This will be used instead of params for the post
data. Any params will be appended to the URL.</div></li>
<li><b>jsonData</b> : Object/String (Optional)<div class="sub-desc">JSON
data to use as the post. Note: This will be used instead of params for the post
data. Any params will be appended to the URL.</div></li>
<li><b>disableCaching</b> : Boolean (Optional)<div class="sub-desc">True
to add a unique cache-buster param to GET requests.</div></li>
</ul></p>
<p>The options object may also contain any other property which might be needed to perform
postprocessing in a callback because it is passed to callback functions.</p></div></li></ul><strong>Returns:</strong><ul><li><code>Number</code><div class="sub-desc">transactionId The id of the server transaction. This may be used
to cancel the request.</div></li></ul></div></div></div></td><td class="msource"><a href="output/Ext.data.Connection.html#request" ext:member="#request" ext:cls="Ext.data.Connection">Connection</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-resumeEvents"></a><b class="method"><a href="source/Observable.html#method-Ext.util.Observable-resumeEvents">resumeEvents</a></b><span class="openparen">(</span><span class="closeparen">)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">void</span><div class="mdesc"><div class="short">Resume firing events. (see suspendEvents)
If events were suspended using the queueSuspended parameter, then all
event...</div><div class="long">Resume firing events. (see <a href="output/Ext.util.Observable.html#Ext.util.Observable-suspendEvents" ext:member="suspendEvents" ext:cls="Ext.util.Observable">suspendEvents</a>)
If events were suspended using the <tt><b>queueSuspended</b></tt> parameter, then all
events fired during event suspension will be sent to any listeners now.<div class="mdetail-params"><strong>Parameters:</strong><ul><li>None.</li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#resumeEvents" ext:member="#resumeEvents" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable "><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.Ajax-serializeForm"></a><b class="method"><a href="source/Connection.html#method-Ext.Ajax-serializeForm">serializeForm</a></b><span class="openparen">(&nbsp;</span><span title="Required" class="required">String/HTMLElement&nbsp;form</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">String</span><div class="mdesc"><div class="short">Serialize the passed form into a url encoded string</div><div class="long">Serialize the passed form into a url encoded string<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>form</code> : String/HTMLElement<div class="sub-desc"></div></li></ul><strong>Returns:</strong><ul><li><code>String</code><div class="sub-desc"></div></li></ul></div></div></div></td><td class="msource">Ajax</td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-suspendEvents"></a><b class="method"><a href="source/Observable.html#method-Ext.util.Observable-suspendEvents">suspendEvents</a></b><span class="openparen">(&nbsp;</span><span title="Required" class="required">Boolean&nbsp;queueSuspended</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">void</span><div class="mdesc"><div class="short">Suspend the firing of all events. (see resumeEvents)</div><div class="long">Suspend the firing of all events. (see <a href="output/Ext.util.Observable.html#Ext.util.Observable-resumeEvents" ext:member="resumeEvents" ext:cls="Ext.util.Observable">resumeEvents</a>)<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>queueSuspended</code> : Boolean<div class="sub-desc">Pass as true to queue up suspended events to be fired
after the <a href="output/Ext.util.Observable.html#Ext.util.Observable-resumeEvents" ext:member="resumeEvents" ext:cls="Ext.util.Observable">resumeEvents</a> call instead of discarding all suspended events;</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#suspendEvents" ext:member="#suspendEvents" ext:cls="Ext.util.Observable">Observable</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.util.Observable-un"></a><b class="method"><a href="source/Observable.html#method-Ext.util.Observable-un">un</a></b><span class="openparen">(&nbsp;</span><span title="Required" class="required">String&nbsp;eventName</span><span class="comma">,&nbsp;</span><span title="Required" class="required">Function&nbsp;handler</span><span class="comma">,&nbsp;</span><span title="Optional" class="optional">[Object&nbsp;scope]</span><span class="closeparen">&nbsp;)</span><span class="colon">&nbsp;:&nbsp;</span><span class="return">void</span><div class="mdesc"><div class="short">Removes an event handler (shorthand for removeListener.)</div><div class="long">Removes an event handler (shorthand for <a href="output/Ext.util.Observable.html#Ext.util.Observable-removeListener" ext:member="removeListener" ext:cls="Ext.util.Observable">removeListener</a>.)<div class="mdetail-params"><strong>Parameters:</strong><ul><li><code>eventName</code> : String<div class="sub-desc">The type of event the handler was associated with.</div></li><li><code>handler</code> : Function<div class="sub-desc">The handler to remove. <b>This must be a reference to the function passed into the <a href="output/Ext.util.Observable.html#Ext.util.Observable-addListener" ext:member="addListener" ext:cls="Ext.util.Observable">addListener</a> call.</b></div></li><li><code>scope</code> : Object<div class="sub-desc">(optional) The scope originally specified for the handler.</div></li></ul><strong>Returns:</strong><ul><li>void</li></ul></div></div></div></td><td class="msource"><a href="output/Ext.util.Observable.html#un" ext:member="#un" ext:cls="Ext.util.Observable">Observable</a></td></tr></tbody></table><a id="Ext.Ajax-events"></a><h2>Public Events</h2><table cellspacing="0" class="member-table"><tbody><tr><th colspan="2" class="sig-header">Event</th><th class="msource-header">Defined By</th></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.data.Connection-beforerequest"></a><b class="event"><a href="source/Connection.html#event-Ext.data.Connection-beforerequest">beforerequest</a></b><span class="colon">&nbsp;:&nbsp;</span><span class="openparen">(&nbsp;</span><span title="Required" class="required">Connection&nbsp;conn</span><span class="comma">,&nbsp;</span><span title="Required" class="required">Object&nbsp;options</span><span class="closeparen">&nbsp;)</span><span>&nbsp;</span><div class="mdesc"><div class="short">Fires before a network request is made to retrieve a data object.</div><div class="long">Fires before a network request is made to retrieve a data object.<div class="mdetail-params"><strong style="font-weight: normal;">Listeners will be called with the following arguments:</strong><ul><li><code>conn</code> : Connection<div class="sub-desc">This Connection object.</div></li><li><code>options</code> : Object<div class="sub-desc">The options config object passed to the <a href="output/Ext.data.Connection.html#Ext.data.Connection-request" ext:member="request" ext:cls="Ext.data.Connection">request</a> method.</div></li></ul></div></div></div></td><td class="msource"><a href="output/Ext.data.Connection.html#beforerequest" ext:member="#beforerequest" ext:cls="Ext.data.Connection">Connection</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.data.Connection-requestcomplete"></a><b class="event"><a href="source/Connection.html#event-Ext.data.Connection-requestcomplete">requestcomplete</a></b><span class="colon">&nbsp;:&nbsp;</span><span class="openparen">(&nbsp;</span><span title="Required" class="required">Connection&nbsp;conn</span><span class="comma">,&nbsp;</span><span title="Required" class="required">Object&nbsp;response</span><span class="comma">,&nbsp;</span><span title="Required" class="required">Object&nbsp;options</span><span class="closeparen">&nbsp;)</span><span>&nbsp;</span><div class="mdesc"><div class="short">Fires if the request was successfully completed.</div><div class="long">Fires if the request was successfully completed.<div class="mdetail-params"><strong style="font-weight: normal;">Listeners will be called with the following arguments:</strong><ul><li><code>conn</code> : Connection<div class="sub-desc">This Connection object.</div></li><li><code>response</code> : Object<div class="sub-desc">The XHR object containing the response data.
See <a href="http://www.w3.org/TR/XMLHttpRequest/">The XMLHttpRequest Object</a>
for details.</div></li><li><code>options</code> : Object<div class="sub-desc">The options config object passed to the <a href="output/Ext.data.Connection.html#Ext.data.Connection-request" ext:member="request" ext:cls="Ext.data.Connection">request</a> method.</div></li></ul></div></div></div></td><td class="msource"><a href="output/Ext.data.Connection.html#requestcomplete" ext:member="#requestcomplete" ext:cls="Ext.data.Connection">Connection</a></td></tr><tr class="method-row expandable inherited"><td class="micon"><a href="#expand" class="exi">&nbsp;</a></td><td class="sig"><a id="Ext.data.Connection-requestexception"></a><b class="event"><a href="source/Connection.html#event-Ext.data.Connection-requestexception">requestexception</a></b><span class="colon">&nbsp;:&nbsp;</span><span class="openparen">(&nbsp;</span><span title="Required" class="required">Connection&nbsp;conn</span><span class="comma">,&nbsp;</span><span title="Required" class="required">Object&nbsp;response</span><span class="comma">,&nbsp;</span><span title="Required" class="required">Object&nbsp;options</span><span class="closeparen">&nbsp;)</span><span>&nbsp;</span><div class="mdesc"><div class="short">Fires if an error HTTP status was returned from the server.
See &lt;a href="http://www.w3.org/Protocols/rfc2616/rfc2616-...</div><div class="long">Fires if an error HTTP status was returned from the server.
See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html">HTTP Status Code Definitions</a>
for details of HTTP status codes.<div class="mdetail-params"><strong style="font-weight: normal;">Listeners will be called with the following arguments:</strong><ul><li><code>conn</code> : Connection<div class="sub-desc">This Connection object.</div></li><li><code>response</code> : Object<div class="sub-desc">The XHR object containing the response data.
See <a href="http://www.w3.org/TR/XMLHttpRequest/">The XMLHttpRequest Object</a>
for details.</div></li><li><code>options</code> : Object<div class="sub-desc">The options config object passed to the <a href="output/Ext.data.Connection.html#Ext.data.Connection-request" ext:member="request" ext:cls="Ext.data.Connection">request</a> method.</div></li></ul></div></div></div></td><td class="msource"><a href="output/Ext.data.Connection.html#requestexception" ext:member="#requestexception" ext:cls="Ext.data.Connection">Connection</a></td></tr></tbody></table></div>